A world-class walkway, the pedestrian tunnel allows people to walk from Wynyard Station to Barangaroo in approximately six minutes, avoiding steep inclines and road crossings. The project increased capacity of Wynyard Station to meet current and future demands, including catering for the Barangaroo development which accommodates 23,000 office workers and attracts up to 33,000 visitors per day.
PSM was engaged to design the temporary tunnel support and permanent structural lining of the pedestrian tunnel, as well as provide for drainage and waterproofing. Detailed site investigations were undertaken to assess the stability of the footings of the overlying 21-storey building.
Construction phase services included geological mapping of exposed conditions, assessment of construction works and instrumentation results, and review of support requirements.
This shallow tunnel is very close to live traffic and buried services, with the tunnel crown excavated through old fill at the Western portal. Existing infrastructure included footings from a 21-storey building founded just above the tunnel.
Engineering and technical opportunities included:
Following rigorous assessment and modelling, PSM’s tailored approach included:
PSM successfully interacted with numerous stakeholders and provided practical solutions to a range of extremely complex design issues and constraints, including unforeseen geometric constraints. PSM’s innovative design solutions satisfied all project requirements and were successfully implemented by the contractor.
Services: #Award Winning #infrastructure #Tunnelling
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